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ID = 25193
Tube type:  Beam Power Tube 
Identical to 4604

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 6.3 Volts / If 0.65 Ampere / Direct / Parallel, (AC/DC)
  4604: RCA TT
Götz Linss
4604: Manufacturer's Literature
Emilio Ciardiello

4604: RCA Transmitting Tubes TT-5
Emilio Ciardiello

from Just Qvigstad

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